Paddy what software are you running ?
I use Inspire which came before flexi, the windows fonts are accessed through the windows font file and the ATM fonts are accessed through ATM so you need to have this installed to access the fonts.
I tried the demo version of signgo and vmp and these only seemed to work with true type fonts.
Glad to see you have it sorted, most of the ATM fonts are available in TT format, But you might have to look about a bit and some have slightly different names
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